nsz Git - cparser/blob - type.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <stdio.h>
  23 #include <assert.h>
  24
  25 #include "type_t.h"
  26 #include "types.h"
  27 #include "entity_t.h"
  28 #include "symbol_t.h"
  29 #include "type_hash.h"
  30 #include "adt/error.h"
  31 #include "adt/util.h"
  32 #include "lang_features.h"
  33 #include "warning.h"
  34 #include "diagnostic.h"
  35 #include "printer.h"
  36
  37 /** The default calling convention. */
  38 cc_kind_t default_calling_convention = CC_CDECL;
  39
  40 static struct obstack type_obst;
  41 static bool           print_implicit_array_size = false;
  42
  43 static void intern_print_type_pre(const type_t *type);
  44 static void intern_print_type_post(const type_t *type);
  45
  46 typedef struct atomic_type_properties_t atomic_type_properties_t;
  47 struct atomic_type_properties_t {
  48         unsigned   size;              /**< type size in bytes */
  49         unsigned   alignment;         /**< type alignment in bytes */
  50         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  51 };
  52
  53 /**
  54  * Returns the size of a type node.
  55  *
  56  * @param kind  the type kind
  57  */
  58 static size_t get_type_struct_size(type_kind_t kind)
  59 {
  60         static const size_t sizes[] = {
  61                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
  62                 [TYPE_COMPLEX]         = sizeof(complex_type_t),
  63                 [TYPE_IMAGINARY]       = sizeof(imaginary_type_t),
  64                 [TYPE_BITFIELD]        = sizeof(bitfield_type_t),
  65                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
  66                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
  67                 [TYPE_ENUM]            = sizeof(enum_type_t),
  68                 [TYPE_FUNCTION]        = sizeof(function_type_t),
  69                 [TYPE_POINTER]         = sizeof(pointer_type_t),
  70                 [TYPE_REFERENCE]       = sizeof(reference_type_t),
  71                 [TYPE_ARRAY]           = sizeof(array_type_t),
  72                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
  73                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
  74         };
  75         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
  76         assert(kind <= TYPE_TYPEOF);
  77         assert(sizes[kind] != 0);
  78         return sizes[kind];
  79 }
  80
  81 type_t *allocate_type_zero(type_kind_t kind)
  82 {
  83         size_t  const size = get_type_struct_size(kind);
  84         type_t *const res  = obstack_alloc(&type_obst, size);
  85         memset(res, 0, size);
  86         res->base.kind = kind;
  87
  88         return res;
  89 }
  90
  91 /**
  92  * Properties of atomic types.
  93  */
  94 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  95         //ATOMIC_TYPE_INVALID = 0,
  96         [ATOMIC_TYPE_VOID] = {
  97                 .size       = 0,
  98                 .alignment  = 0,
  99                 .flags      = ATOMIC_TYPE_FLAG_NONE
 100         },
 101         [ATOMIC_TYPE_WCHAR_T] = {
 102                 .size       = (unsigned)-1,
 103                 .alignment  = (unsigned)-1,
 104                 /* signed flag will be set when known */
 105                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 106         },
 107         [ATOMIC_TYPE_CHAR] = {
 108                 .size       = 1,
 109                 .alignment  = 1,
 110                 /* signed flag will be set when known */
 111                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 112         },
 113         [ATOMIC_TYPE_SCHAR] = {
 114                 .size       = 1,
 115                 .alignment  = 1,
 116                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 117                               | ATOMIC_TYPE_FLAG_SIGNED,
 118         },
 119         [ATOMIC_TYPE_UCHAR] = {
 120                 .size       = 1,
 121                 .alignment  = 1,
 122                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 123         },
 124         [ATOMIC_TYPE_SHORT] = {
 125                 .size       = 2,
 126                 .alignment  = 2,
 127                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 128                               | ATOMIC_TYPE_FLAG_SIGNED
 129         },
 130         [ATOMIC_TYPE_USHORT] = {
 131                 .size       = 2,
 132                 .alignment  = 2,
 133                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 134         },
 135         [ATOMIC_TYPE_INT] = {
 136                 .size       = (unsigned) -1,
 137                 .alignment  = (unsigned) -1,
 138                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 139                               | ATOMIC_TYPE_FLAG_SIGNED,
 140         },
 141         [ATOMIC_TYPE_UINT] = {
 142                 .size       = (unsigned) -1,
 143                 .alignment  = (unsigned) -1,
 144                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 145         },
 146         [ATOMIC_TYPE_LONG] = {
 147                 .size       = (unsigned) -1,
 148                 .alignment  = (unsigned) -1,
 149                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 150                               | ATOMIC_TYPE_FLAG_SIGNED,
 151         },
 152         [ATOMIC_TYPE_ULONG] = {
 153                 .size       = (unsigned) -1,
 154                 .alignment  = (unsigned) -1,
 155                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 156         },
 157         [ATOMIC_TYPE_LONGLONG] = {
 158                 .size       = (unsigned) -1,
 159                 .alignment  = (unsigned) -1,
 160                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 161                               | ATOMIC_TYPE_FLAG_SIGNED,
 162         },
 163         [ATOMIC_TYPE_ULONGLONG] = {
 164                 .size       = (unsigned) -1,
 165                 .alignment  = (unsigned) -1,
 166                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 167         },
 168         [ATOMIC_TYPE_BOOL] = {
 169                 .size       = (unsigned) -1,
 170                 .alignment  = (unsigned) -1,
 171                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 172         },
 173         [ATOMIC_TYPE_FLOAT] = {
 174                 .size       = 4,
 175                 .alignment  = (unsigned) -1,
 176                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 177                               | ATOMIC_TYPE_FLAG_SIGNED,
 178         },
 179         [ATOMIC_TYPE_DOUBLE] = {
 180                 .size       = 8,
 181                 .alignment  = (unsigned) -1,
 182                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 183                               | ATOMIC_TYPE_FLAG_SIGNED,
 184         },
 185         [ATOMIC_TYPE_LONG_DOUBLE] = {
 186                 .size       = (unsigned) -1, /* will be filled in later */
 187                 .alignment  = (unsigned) -1,
 188                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 189                               | ATOMIC_TYPE_FLAG_SIGNED,
 190         },
 191         /* complex and imaginary types are set in init_types */
 192 };
 193
 194 static inline bool is_po2(unsigned x)
 195 {
 196         return (x & (x-1)) == 0;
 197 }
 198
 199 void init_types(void)
 200 {
 201         obstack_init(&type_obst);
 202
 203         atomic_type_properties_t *props = atomic_type_properties;
 204
 205         if (char_is_signed) {
 206                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 207         }
 208
 209         unsigned int_size   = machine_size < 32 ? 2 : 4;
 210         /* long is always 32bit on windows */
 211         unsigned long_size  = c_mode & _MS ? 4 : (machine_size < 64 ? 4 : 8);
 212         unsigned llong_size = machine_size < 32 ? 4 : 8;
 213
 214         props[ATOMIC_TYPE_INT].size            = int_size;
 215         props[ATOMIC_TYPE_INT].alignment       = int_size;
 216         props[ATOMIC_TYPE_UINT].size           = int_size;
 217         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 218         props[ATOMIC_TYPE_LONG].size           = long_size;
 219         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 220         props[ATOMIC_TYPE_ULONG].size          = long_size;
 221         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 222         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 223         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 224         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 225         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 226
 227         /* TODO: backend specific, need a way to query the backend for this.
 228          * The following are good settings for x86 */
 229         if (machine_size <= 32) {
 230                 props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 231                 props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 232                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 233                 props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 234                 props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 235         } else {
 236                 props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 237                 props[ATOMIC_TYPE_DOUBLE].alignment      = 8;
 238                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 8;
 239                 props[ATOMIC_TYPE_LONGLONG].alignment    = 8;
 240                 props[ATOMIC_TYPE_ULONGLONG].alignment   = 8;
 241         }
 242
 243         if (long_double_size > 0) {
 244                 props[ATOMIC_TYPE_LONG_DOUBLE].size      = long_double_size;
 245                 if (is_po2(long_double_size)) {
 246                         props[ATOMIC_TYPE_LONG_DOUBLE].alignment = long_double_size;
 247                 }
 248         } else {
 249                 props[ATOMIC_TYPE_LONG_DOUBLE] = props[ATOMIC_TYPE_DOUBLE];
 250         }
 251
 252         /* TODO: make this configurable for platforms which do not use byte sized
 253          * bools. */
 254         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UCHAR];
 255
 256         props[ATOMIC_TYPE_WCHAR_T] = props[wchar_atomic_kind];
 257 }
 258
 259 void exit_types(void)
 260 {
 261         obstack_free(&type_obst, NULL);
 262 }
 263
 264 void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q)
 265 {
 266         size_t sep = q & QUAL_SEP_START ? 0 : 1;
 267         if (qualifiers & TYPE_QUALIFIER_CONST) {
 268                 print_string(" const" + sep);
 269                 sep = 0;
 270         }
 271         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 272                 print_string(" volatile" + sep);
 273                 sep = 0;
 274         }
 275         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 276                 print_string(" restrict" + sep);
 277                 sep = 0;
 278         }
 279         if (sep == 0 && q & QUAL_SEP_END)
 280                 print_char(' ');
 281 }
 282
 283 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 284 {
 285         switch(kind) {
 286         case ATOMIC_TYPE_INVALID: break;
 287         case ATOMIC_TYPE_VOID:        return "void";
 288         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 289         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 290         case ATOMIC_TYPE_CHAR:        return "char";
 291         case ATOMIC_TYPE_SCHAR:       return "signed char";
 292         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 293         case ATOMIC_TYPE_INT:         return "int";
 294         case ATOMIC_TYPE_UINT:        return "unsigned int";
 295         case ATOMIC_TYPE_SHORT:       return "short";
 296         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 297         case ATOMIC_TYPE_LONG:        return "long";
 298         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 299         case ATOMIC_TYPE_LONGLONG:    return "long long";
 300         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 301         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 302         case ATOMIC_TYPE_FLOAT:       return "float";
 303         case ATOMIC_TYPE_DOUBLE:      return "double";
 304         }
 305         return "INVALIDATOMIC";
 306 }
 307
 308 /**
 309  * Prints the name of an atomic type kinds.
 310  *
 311  * @param kind  The type kind.
 312  */
 313 static void print_atomic_kinds(atomic_type_kind_t kind)
 314 {
 315         const char *s = get_atomic_kind_name(kind);
 316         print_string(s);
 317 }
 318
 319 /**
 320  * Prints the name of an atomic type.
 321  *
 322  * @param type  The type.
 323  */
 324 static void print_atomic_type(const atomic_type_t *type)
 325 {
 326         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 327         print_atomic_kinds(type->akind);
 328 }
 329
 330 /**
 331  * Prints the name of a complex type.
 332  *
 333  * @param type  The type.
 334  */
 335 static void print_complex_type(const complex_type_t *type)
 336 {
 337         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 338         print_string("_Complex");
 339         print_atomic_kinds(type->akind);
 340 }
 341
 342 /**
 343  * Prints the name of an imaginary type.
 344  *
 345  * @param type  The type.
 346  */
 347 static void print_imaginary_type(const imaginary_type_t *type)
 348 {
 349         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 350         print_string("_Imaginary ");
 351         print_atomic_kinds(type->akind);
 352 }
 353
 354 /**
 355  * Print the first part (the prefix) of a type.
 356  *
 357  * @param type   The type to print.
 358  */
 359 static void print_function_type_pre(const function_type_t *type)
 360 {
 361         switch (type->linkage) {
 362                 case LINKAGE_INVALID:
 363                         break;
 364
 365                 case LINKAGE_C:
 366                         if (c_mode & _CXX)
 367                                 print_string("extern \"C\" ");
 368                         break;
 369
 370                 case LINKAGE_CXX:
 371                         if (!(c_mode & _CXX))
 372                                 print_string("extern \"C++\" ");
 373                         break;
 374         }
 375
 376         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 377
 378         intern_print_type_pre(type->return_type);
 379
 380         cc_kind_t cc = type->calling_convention;
 381 restart:
 382         switch (cc) {
 383         case CC_CDECL:    print_string(" __cdecl");    break;
 384         case CC_STDCALL:  print_string(" __stdcall");  break;
 385         case CC_FASTCALL: print_string(" __fastcall"); break;
 386         case CC_THISCALL: print_string(" __thiscall"); break;
 387         case CC_DEFAULT:
 388                 if (default_calling_convention != CC_CDECL) {
 389                         /* show the default calling convention if its not cdecl */
 390                         cc = default_calling_convention;
 391                         goto restart;
 392                 }
 393                 break;
 394         }
 395 }
 396
 397 /**
 398  * Print the second part (the postfix) of a type.
 399  *
 400  * @param type   The type to print.
 401  */
 402 static void print_function_type_post(const function_type_t *type,
 403                                      const scope_t *parameters)
 404 {
 405         print_string("(");
 406         bool first = true;
 407         if (parameters == NULL) {
 408                 function_parameter_t *parameter = type->parameters;
 409                 for( ; parameter != NULL; parameter = parameter->next) {
 410                         if (first) {
 411                                 first = false;
 412                         } else {
 413                                 print_string(", ");
 414                         }
 415                         print_type(parameter->type);
 416                 }
 417         } else {
 418                 entity_t *parameter = parameters->entities;
 419                 for (; parameter != NULL; parameter = parameter->base.next) {
 420                         if (parameter->kind != ENTITY_PARAMETER)
 421                                 continue;
 422
 423                         if (first) {
 424                                 first = false;
 425                         } else {
 426                                 print_string(", ");
 427                         }
 428                         const type_t *const param_type = parameter->declaration.type;
 429                         if (param_type == NULL) {
 430                                 print_string(parameter->base.symbol->string);
 431                         } else {
 432                                 print_type_ext(param_type, parameter->base.symbol, NULL);
 433                         }
 434                 }
 435         }
 436         if (type->variadic) {
 437                 if (first) {
 438                         first = false;
 439                 } else {
 440                         print_string(", ");
 441                 }
 442                 print_string("...");
 443         }
 444         if (first && !type->unspecified_parameters) {
 445                 print_string("void");
 446         }
 447         print_string(")");
 448
 449         intern_print_type_post(type->return_type);
 450 }
 451
 452 /**
 453  * Prints the prefix part of a pointer type.
 454  *
 455  * @param type   The pointer type.
 456  */
 457 static void print_pointer_type_pre(const pointer_type_t *type)
 458 {
 459         type_t const *const points_to = type->points_to;
 460         intern_print_type_pre(points_to);
 461         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 462                 print_string(" (");
 463         variable_t *const variable = type->base_variable;
 464         if (variable != NULL) {
 465                 print_string(" __based(");
 466                 print_string(variable->base.base.symbol->string);
 467                 print_string(") ");
 468         }
 469         print_string("*");
 470         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START);
 471 }
 472
 473 /**
 474  * Prints the postfix part of a pointer type.
 475  *
 476  * @param type   The pointer type.
 477  */
 478 static void print_pointer_type_post(const pointer_type_t *type)
 479 {
 480         type_t const *const points_to = type->points_to;
 481         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 482                 print_string(")");
 483         intern_print_type_post(points_to);
 484 }
 485
 486 /**
 487  * Prints the prefix part of a reference type.
 488  *
 489  * @param type   The reference type.
 490  */
 491 static void print_reference_type_pre(const reference_type_t *type)
 492 {
 493         type_t const *const refers_to = type->refers_to;
 494         intern_print_type_pre(refers_to);
 495         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 496                 print_string(" (");
 497         print_string("&");
 498 }
 499
 500 /**
 501  * Prints the postfix part of a reference type.
 502  *
 503  * @param type   The reference type.
 504  */
 505 static void print_reference_type_post(const reference_type_t *type)
 506 {
 507         type_t const *const refers_to = type->refers_to;
 508         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 509                 print_string(")");
 510         intern_print_type_post(refers_to);
 511 }
 512
 513 /**
 514  * Prints the prefix part of an array type.
 515  *
 516  * @param type   The array type.
 517  */
 518 static void print_array_type_pre(const array_type_t *type)
 519 {
 520         intern_print_type_pre(type->element_type);
 521 }
 522
 523 /**
 524  * Prints the postfix part of an array type.
 525  *
 526  * @param type   The array type.
 527  */
 528 static void print_array_type_post(const array_type_t *type)
 529 {
 530         print_string("[");
 531         if (type->is_static) {
 532                 print_string("static ");
 533         }
 534         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 535         if (type->size_expression != NULL
 536                         && (print_implicit_array_size || !type->has_implicit_size)) {
 537                 print_expression(type->size_expression);
 538         }
 539         print_string("]");
 540         intern_print_type_post(type->element_type);
 541 }
 542
 543 /**
 544  * Prints the postfix part of a bitfield type.
 545  *
 546  * @param type   The array type.
 547  */
 548 static void print_bitfield_type_post(const bitfield_type_t *type)
 549 {
 550         print_string(" : ");
 551         print_expression(type->size_expression);
 552         intern_print_type_post(type->base_type);
 553 }
 554
 555 /**
 556  * Prints an enum definition.
 557  *
 558  * @param declaration  The enum's type declaration.
 559  */
 560 void print_enum_definition(const enum_t *enume)
 561 {
 562         print_string("{\n");
 563
 564         change_indent(1);
 565
 566         entity_t *entry = enume->base.next;
 567         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 568                entry = entry->base.next) {
 569
 570                 print_indent();
 571                 print_string(entry->base.symbol->string);
 572                 if (entry->enum_value.value != NULL) {
 573                         print_string(" = ");
 574
 575                         /* skip the implicit cast */
 576                         expression_t *expression = entry->enum_value.value;
 577                         print_expression(expression);
 578                 }
 579                 print_string(",\n");
 580         }
 581
 582         change_indent(-1);
 583         print_indent();
 584         print_string("}");
 585 }
 586
 587 /**
 588  * Prints an enum type.
 589  *
 590  * @param type  The enum type.
 591  */
 592 static void print_type_enum(const enum_type_t *type)
 593 {
 594         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 595         print_string("enum ");
 596
 597         enum_t   *enume  = type->enume;
 598         symbol_t *symbol = enume->base.symbol;
 599         if (symbol != NULL) {
 600                 print_string(symbol->string);
 601         } else {
 602                 print_enum_definition(enume);
 603         }
 604 }
 605
 606 /**
 607  * Print the compound part of a compound type.
 608  */
 609 void print_compound_definition(const compound_t *compound)
 610 {
 611         print_string("{\n");
 612         change_indent(1);
 613
 614         entity_t *entity = compound->members.entities;
 615         for( ; entity != NULL; entity = entity->base.next) {
 616                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 617                         continue;
 618
 619                 print_indent();
 620                 print_entity(entity);
 621                 print_string("\n");
 622         }
 623
 624         change_indent(-1);
 625         print_indent();
 626         print_string("}");
 627         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 628                 print_string("__attribute__((__transparent_union__))");
 629         }
 630 }
 631
 632 /**
 633  * Prints a compound type.
 634  *
 635  * @param type  The compound type.
 636  */
 637 static void print_compound_type(const compound_type_t *type)
 638 {
 639         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 640
 641         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 642                 print_string("struct ");
 643         } else {
 644                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 645                 print_string("union ");
 646         }
 647
 648         compound_t *compound = type->compound;
 649         symbol_t   *symbol   = compound->base.symbol;
 650         if (symbol != NULL) {
 651                 print_string(symbol->string);
 652         } else {
 653                 print_compound_definition(compound);
 654         }
 655 }
 656
 657 /**
 658  * Prints the prefix part of a typedef type.
 659  *
 660  * @param type   The typedef type.
 661  */
 662 static void print_typedef_type_pre(const typedef_type_t *const type)
 663 {
 664         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 665         print_string(type->typedefe->base.symbol->string);
 666 }
 667
 668 /**
 669  * Prints the prefix part of a typeof type.
 670  *
 671  * @param type   The typeof type.
 672  */
 673 static void print_typeof_type_pre(const typeof_type_t *const type)
 674 {
 675         print_string("typeof(");
 676         if (type->expression != NULL) {
 677                 print_expression(type->expression);
 678         } else {
 679                 print_type(type->typeof_type);
 680         }
 681         print_string(")");
 682 }
 683
 684 /**
 685  * Prints the prefix part of a type.
 686  *
 687  * @param type   The type.
 688  */
 689 static void intern_print_type_pre(const type_t *const type)
 690 {
 691         switch(type->kind) {
 692         case TYPE_ERROR:
 693                 print_string("<error>");
 694                 return;
 695         case TYPE_INVALID:
 696                 print_string("<invalid>");
 697                 return;
 698         case TYPE_ENUM:
 699                 print_type_enum(&type->enumt);
 700                 return;
 701         case TYPE_ATOMIC:
 702                 print_atomic_type(&type->atomic);
 703                 return;
 704         case TYPE_COMPLEX:
 705                 print_complex_type(&type->complex);
 706                 return;
 707         case TYPE_IMAGINARY:
 708                 print_imaginary_type(&type->imaginary);
 709                 return;
 710         case TYPE_COMPOUND_STRUCT:
 711         case TYPE_COMPOUND_UNION:
 712                 print_compound_type(&type->compound);
 713                 return;
 714         case TYPE_FUNCTION:
 715                 print_function_type_pre(&type->function);
 716                 return;
 717         case TYPE_POINTER:
 718                 print_pointer_type_pre(&type->pointer);
 719                 return;
 720         case TYPE_REFERENCE:
 721                 print_reference_type_pre(&type->reference);
 722                 return;
 723         case TYPE_BITFIELD:
 724                 intern_print_type_pre(type->bitfield.base_type);
 725                 return;
 726         case TYPE_ARRAY:
 727                 print_array_type_pre(&type->array);
 728                 return;
 729         case TYPE_TYPEDEF:
 730                 print_typedef_type_pre(&type->typedeft);
 731                 return;
 732         case TYPE_TYPEOF:
 733                 print_typeof_type_pre(&type->typeoft);
 734                 return;
 735         }
 736         print_string("unknown");
 737 }
 738
 739 /**
 740  * Prints the postfix part of a type.
 741  *
 742  * @param type   The type.
 743  */
 744 static void intern_print_type_post(const type_t *const type)
 745 {
 746         switch(type->kind) {
 747         case TYPE_FUNCTION:
 748                 print_function_type_post(&type->function, NULL);
 749                 return;
 750         case TYPE_POINTER:
 751                 print_pointer_type_post(&type->pointer);
 752                 return;
 753         case TYPE_REFERENCE:
 754                 print_reference_type_post(&type->reference);
 755                 return;
 756         case TYPE_ARRAY:
 757                 print_array_type_post(&type->array);
 758                 return;
 759         case TYPE_BITFIELD:
 760                 print_bitfield_type_post(&type->bitfield);
 761                 return;
 762         case TYPE_ERROR:
 763         case TYPE_INVALID:
 764         case TYPE_ATOMIC:
 765         case TYPE_COMPLEX:
 766         case TYPE_IMAGINARY:
 767         case TYPE_ENUM:
 768         case TYPE_COMPOUND_STRUCT:
 769         case TYPE_COMPOUND_UNION:
 770         case TYPE_TYPEOF:
 771         case TYPE_TYPEDEF:
 772                 break;
 773         }
 774 }
 775
 776 /**
 777  * Prints a type.
 778  *
 779  * @param type   The type.
 780  */
 781 void print_type(const type_t *const type)
 782 {
 783         print_type_ext(type, NULL, NULL);
 784 }
 785
 786 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 787                     const scope_t *parameters)
 788 {
 789         intern_print_type_pre(type);
 790         if (symbol != NULL) {
 791                 print_string(" ");
 792                 print_string(symbol->string);
 793         }
 794         if (type->kind == TYPE_FUNCTION) {
 795                 print_function_type_post(&type->function, parameters);
 796         } else {
 797                 intern_print_type_post(type);
 798         }
 799 }
 800
 801 /**
 802  * Duplicates a type.
 803  *
 804  * @param type  The type to copy.
 805  * @return A copy of the type.
 806  *
 807  * @note This does not produce a deep copy!
 808  */
 809 type_t *duplicate_type(const type_t *type)
 810 {
 811         size_t size = get_type_struct_size(type->kind);
 812
 813         type_t *const copy = obstack_alloc(&type_obst, size);
 814         memcpy(copy, type, size);
 815         copy->base.firm_type = NULL;
 816
 817         return copy;
 818 }
 819
 820 /**
 821  * Returns the unqualified type of a given type.
 822  *
 823  * @param type  The type.
 824  * @returns The unqualified type.
 825  */
 826 type_t *get_unqualified_type(type_t *type)
 827 {
 828         assert(!is_typeref(type));
 829
 830         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 831                 return type;
 832
 833         type_t *unqualified_type          = duplicate_type(type);
 834         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 835
 836         return identify_new_type(unqualified_type);
 837 }
 838
 839 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 840 {
 841         type_t *type = skip_typeref(orig_type);
 842
 843         type_t *copy;
 844         if (is_type_array(type)) {
 845                 /* For array types the element type has to be adjusted */
 846                 type_t *element_type      = type->array.element_type;
 847                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 848
 849                 if (qual_element_type == element_type)
 850                         return orig_type;
 851
 852                 copy                     = duplicate_type(type);
 853                 copy->array.element_type = qual_element_type;
 854         } else if (is_type_valid(type)) {
 855                 if ((type->base.qualifiers & qual) == (int)qual)
 856                         return orig_type;
 857
 858                 copy                   = duplicate_type(type);
 859                 copy->base.qualifiers |= qual;
 860         } else {
 861                 return type;
 862         }
 863
 864         return identify_new_type(copy);
 865 }
 866
 867 /**
 868  * Check if a type is valid.
 869  *
 870  * @param type  The type to check.
 871  * @return true if type represents a valid type.
 872  */
 873 bool type_valid(const type_t *type)
 874 {
 875         return type->kind != TYPE_INVALID;
 876 }
 877
 878 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 879                                   atomic_type_flag_t flag)
 880 {
 881         assert(kind <= ATOMIC_TYPE_LAST);
 882         return (atomic_type_properties[kind].flags & flag) != 0;
 883 }
 884
 885 /**
 886  * Returns true if the given type is an integer type.
 887  *
 888  * @param type  The type to check.
 889  * @return True if type is an integer type.
 890  */
 891 bool is_type_integer(const type_t *type)
 892 {
 893         assert(!is_typeref(type));
 894
 895         if (type->kind == TYPE_ENUM)
 896                 return true;
 897         if (type->kind == TYPE_BITFIELD)
 898                 return true;
 899
 900         if (type->kind != TYPE_ATOMIC)
 901                 return false;
 902
 903         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 904 }
 905
 906 /**
 907  * Returns true if the given type is an enum type.
 908  *
 909  * @param type  The type to check.
 910  * @return True if type is an enum type.
 911  */
 912 bool is_type_enum(const type_t *type)
 913 {
 914         assert(!is_typeref(type));
 915         return type->kind == TYPE_ENUM;
 916 }
 917
 918 /**
 919  * Returns true if the given type is an floating point type.
 920  *
 921  * @param type  The type to check.
 922  * @return True if type is a floating point type.
 923  */
 924 bool is_type_float(const type_t *type)
 925 {
 926         assert(!is_typeref(type));
 927
 928         if (type->kind != TYPE_ATOMIC)
 929                 return false;
 930
 931         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 932 }
 933
 934 /**
 935  * Returns true if the given type is an complex type.
 936  *
 937  * @param type  The type to check.
 938  * @return True if type is a complex type.
 939  */
 940 bool is_type_complex(const type_t *type)
 941 {
 942         assert(!is_typeref(type));
 943
 944         if (type->kind != TYPE_ATOMIC)
 945                 return false;
 946
 947         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 948 }
 949
 950 /**
 951  * Returns true if the given type is a signed type.
 952  *
 953  * @param type  The type to check.
 954  * @return True if type is a signed type.
 955  */
 956 bool is_type_signed(const type_t *type)
 957 {
 958         assert(!is_typeref(type));
 959
 960         /* enum types are int for now */
 961         if (type->kind == TYPE_ENUM)
 962                 return true;
 963         if (type->kind == TYPE_BITFIELD)
 964                 return is_type_signed(type->bitfield.base_type);
 965
 966         if (type->kind != TYPE_ATOMIC)
 967                 return false;
 968
 969         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 970 }
 971
 972 /**
 973  * Returns true if the given type represents an arithmetic type.
 974  *
 975  * @param type  The type to check.
 976  * @return True if type represents an arithmetic type.
 977  */
 978 bool is_type_arithmetic(const type_t *type)
 979 {
 980         assert(!is_typeref(type));
 981
 982         switch(type->kind) {
 983         case TYPE_BITFIELD:
 984         case TYPE_ENUM:
 985                 return true;
 986         case TYPE_ATOMIC:
 987                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 988         case TYPE_COMPLEX:
 989                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 990         case TYPE_IMAGINARY:
 991                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 992         default:
 993                 return false;
 994         }
 995 }
 996
 997 /**
 998  * Returns true if the given type is an integer or float type.
 999  *
1000  * @param type  The type to check.
1001  * @return True if type is an integer or float type.
1002  */
1003 bool is_type_real(const type_t *type)
1004 {
1005         /* 6.2.5 (17) */
1006         return is_type_integer(type) || is_type_float(type);
1007 }
1008
1009 /**
1010  * Returns true if the given type represents a scalar type.
1011  *
1012  * @param type  The type to check.
1013  * @return True if type represents a scalar type.
1014  */
1015 bool is_type_scalar(const type_t *type)
1016 {
1017         assert(!is_typeref(type));
1018
1019         if (type->kind == TYPE_POINTER)
1020                 return true;
1021
1022         return is_type_arithmetic(type);
1023 }
1024
1025 /**
1026  * Check if a given type is incomplete.
1027  *
1028  * @param type  The type to check.
1029  * @return True if the given type is incomplete (ie. just forward).
1030  */
1031 bool is_type_incomplete(const type_t *type)
1032 {
1033         assert(!is_typeref(type));
1034
1035         switch(type->kind) {
1036         case TYPE_COMPOUND_STRUCT:
1037         case TYPE_COMPOUND_UNION: {
1038                 const compound_type_t *compound_type = &type->compound;
1039                 return !compound_type->compound->complete;
1040         }
1041         case TYPE_ENUM:
1042                 return false;
1043
1044         case TYPE_ARRAY:
1045                 return type->array.size_expression == NULL
1046                         && !type->array.size_constant;
1047
1048         case TYPE_ATOMIC:
1049                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1050
1051         case TYPE_COMPLEX:
1052                 return type->complex.akind == ATOMIC_TYPE_VOID;
1053
1054         case TYPE_IMAGINARY:
1055                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1056
1057         case TYPE_BITFIELD:
1058         case TYPE_FUNCTION:
1059         case TYPE_POINTER:
1060         case TYPE_REFERENCE:
1061         case TYPE_ERROR:
1062                 return false;
1063
1064         case TYPE_TYPEDEF:
1065         case TYPE_TYPEOF:
1066                 panic("is_type_incomplete called without typerefs skipped");
1067         case TYPE_INVALID:
1068                 break;
1069         }
1070
1071         panic("invalid type found");
1072 }
1073
1074 bool is_type_object(const type_t *type)
1075 {
1076         return !is_type_function(type) && !is_type_incomplete(type);
1077 }
1078
1079 /**
1080  * Check if two function types are compatible.
1081  */
1082 static bool function_types_compatible(const function_type_t *func1,
1083                                       const function_type_t *func2)
1084 {
1085         const type_t* const ret1 = skip_typeref(func1->return_type);
1086         const type_t* const ret2 = skip_typeref(func2->return_type);
1087         if (!types_compatible(ret1, ret2))
1088                 return false;
1089
1090         if (func1->linkage != func2->linkage)
1091                 return false;
1092
1093         cc_kind_t cc1 = func1->calling_convention;
1094         if (cc1 == CC_DEFAULT)
1095                 cc1 = default_calling_convention;
1096         cc_kind_t cc2 = func2->calling_convention;
1097         if (cc2 == CC_DEFAULT)
1098                 cc2 = default_calling_convention;
1099
1100         if (cc1 != cc2)
1101                 return false;
1102
1103         if (func1->variadic != func2->variadic)
1104                 return false;
1105
1106         /* can parameters be compared? */
1107         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
1108                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
1109                 return true;
1110
1111         /* TODO: handling of unspecified parameters not correct yet */
1112
1113         /* all argument types must be compatible */
1114         function_parameter_t *parameter1 = func1->parameters;
1115         function_parameter_t *parameter2 = func2->parameters;
1116         for ( ; parameter1 != NULL && parameter2 != NULL;
1117                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1118                 type_t *parameter1_type = skip_typeref(parameter1->type);
1119                 type_t *parameter2_type = skip_typeref(parameter2->type);
1120
1121                 parameter1_type = get_unqualified_type(parameter1_type);
1122                 parameter2_type = get_unqualified_type(parameter2_type);
1123
1124                 if (!types_compatible(parameter1_type, parameter2_type))
1125                         return false;
1126         }
1127         /* same number of arguments? */
1128         if (parameter1 != NULL || parameter2 != NULL)
1129                 return false;
1130
1131         return true;
1132 }
1133
1134 /**
1135  * Check if two array types are compatible.
1136  */
1137 static bool array_types_compatible(const array_type_t *array1,
1138                                    const array_type_t *array2)
1139 {
1140         type_t *element_type1 = skip_typeref(array1->element_type);
1141         type_t *element_type2 = skip_typeref(array2->element_type);
1142         if (!types_compatible(element_type1, element_type2))
1143                 return false;
1144
1145         if (!array1->size_constant || !array2->size_constant)
1146                 return true;
1147
1148         return array1->size == array2->size;
1149 }
1150
1151 /**
1152  * Check if two types are compatible.
1153  */
1154 bool types_compatible(const type_t *type1, const type_t *type2)
1155 {
1156         assert(!is_typeref(type1));
1157         assert(!is_typeref(type2));
1158
1159         /* shortcut: the same type is always compatible */
1160         if (type1 == type2)
1161                 return true;
1162
1163         if (!is_type_valid(type1) || !is_type_valid(type2))
1164                 return true;
1165
1166         if (type1->base.qualifiers != type2->base.qualifiers)
1167                 return false;
1168         if (type1->kind != type2->kind)
1169                 return false;
1170
1171         switch (type1->kind) {
1172         case TYPE_FUNCTION:
1173                 return function_types_compatible(&type1->function, &type2->function);
1174         case TYPE_ATOMIC:
1175                 return type1->atomic.akind == type2->atomic.akind;
1176         case TYPE_COMPLEX:
1177                 return type1->complex.akind == type2->complex.akind;
1178         case TYPE_IMAGINARY:
1179                 return type1->imaginary.akind == type2->imaginary.akind;
1180         case TYPE_ARRAY:
1181                 return array_types_compatible(&type1->array, &type2->array);
1182
1183         case TYPE_POINTER: {
1184                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1185                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1186                 return types_compatible(to1, to2);
1187         }
1188
1189         case TYPE_REFERENCE: {
1190                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1191                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1192                 return types_compatible(to1, to2);
1193         }
1194
1195         case TYPE_COMPOUND_STRUCT:
1196         case TYPE_COMPOUND_UNION: {
1197
1198
1199                 break;
1200         }
1201         case TYPE_ENUM:
1202                 /* TODO: not implemented */
1203                 break;
1204
1205         case TYPE_BITFIELD:
1206                 /* not sure if this makes sense or is even needed, implement it if you
1207                  * really need it! */
1208                 panic("type compatibility check for bitfield type");
1209
1210         case TYPE_ERROR:
1211                 /* Hmm, the error type should be compatible to all other types */
1212                 return true;
1213         case TYPE_INVALID:
1214                 panic("invalid type found in compatible types");
1215         case TYPE_TYPEDEF:
1216         case TYPE_TYPEOF:
1217                 panic("typerefs not skipped in compatible types?!?");
1218         }
1219
1220         /* TODO: incomplete */
1221         return false;
1222 }
1223
1224 /**
1225  * Skip all typerefs and return the underlying type.
1226  */
1227 type_t *skip_typeref(type_t *type)
1228 {
1229         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1230
1231         while (true) {
1232                 switch (type->kind) {
1233                 case TYPE_ERROR:
1234                         return type;
1235                 case TYPE_TYPEDEF: {
1236                         qualifiers |= type->base.qualifiers;
1237
1238                         const typedef_type_t *typedef_type = &type->typedeft;
1239                         if (typedef_type->resolved_type != NULL) {
1240                                 type = typedef_type->resolved_type;
1241                                 break;
1242                         }
1243                         type = typedef_type->typedefe->type;
1244                         continue;
1245                 }
1246                 case TYPE_TYPEOF:
1247                         qualifiers |= type->base.qualifiers;
1248                         type        = type->typeoft.typeof_type;
1249                         continue;
1250                 default:
1251                         break;
1252                 }
1253                 break;
1254         }
1255
1256         if (qualifiers != TYPE_QUALIFIER_NONE) {
1257                 type_t *const copy = duplicate_type(type);
1258
1259                 /* for const with typedefed array type the element type has to be
1260                  * adjusted */
1261                 if (is_type_array(copy)) {
1262                         type_t *element_type           = copy->array.element_type;
1263                         element_type                   = duplicate_type(element_type);
1264                         element_type->base.qualifiers |= qualifiers;
1265                         copy->array.element_type       = element_type;
1266                 } else {
1267                         copy->base.qualifiers |= qualifiers;
1268                 }
1269
1270                 type = identify_new_type(copy);
1271         }
1272
1273         return type;
1274 }
1275
1276 unsigned get_type_size(type_t *type)
1277 {
1278         switch (type->kind) {
1279         case TYPE_INVALID:
1280                 break;
1281         case TYPE_ERROR:
1282                 return 0;
1283         case TYPE_ATOMIC:
1284                 return get_atomic_type_size(type->atomic.akind);
1285         case TYPE_COMPLEX:
1286                 return get_atomic_type_size(type->complex.akind) * 2;
1287         case TYPE_IMAGINARY:
1288                 return get_atomic_type_size(type->imaginary.akind);
1289         case TYPE_COMPOUND_UNION:
1290                 layout_union_type(&type->compound);
1291                 return type->compound.compound->size;
1292         case TYPE_COMPOUND_STRUCT:
1293                 layout_struct_type(&type->compound);
1294                 return type->compound.compound->size;
1295         case TYPE_ENUM:
1296                 return get_atomic_type_size(type->enumt.akind);
1297         case TYPE_FUNCTION:
1298                 return 0; /* non-const (but "address-const") */
1299         case TYPE_REFERENCE:
1300         case TYPE_POINTER:
1301                 /* TODO: make configurable by backend */
1302                 return 4;
1303         case TYPE_ARRAY: {
1304                 /* TODO: correct if element_type is aligned? */
1305                 il_size_t element_size = get_type_size(type->array.element_type);
1306                 return type->array.size * element_size;
1307         }
1308         case TYPE_BITFIELD:
1309                 return 0;
1310         case TYPE_TYPEDEF:
1311                 return get_type_size(type->typedeft.typedefe->type);
1312         case TYPE_TYPEOF:
1313                 if (type->typeoft.typeof_type) {
1314                         return get_type_size(type->typeoft.typeof_type);
1315                 } else {
1316                         return get_type_size(type->typeoft.expression->base.type);
1317                 }
1318         }
1319         panic("invalid type in get_type_size");
1320 }
1321
1322 unsigned get_type_alignment(type_t *type)
1323 {
1324         switch (type->kind) {
1325         case TYPE_INVALID:
1326                 break;
1327         case TYPE_ERROR:
1328                 return 0;
1329         case TYPE_ATOMIC:
1330                 return get_atomic_type_alignment(type->atomic.akind);
1331         case TYPE_COMPLEX:
1332                 return get_atomic_type_alignment(type->complex.akind);
1333         case TYPE_IMAGINARY:
1334                 return get_atomic_type_alignment(type->imaginary.akind);
1335         case TYPE_COMPOUND_UNION:
1336                 layout_union_type(&type->compound);
1337                 return type->compound.compound->alignment;
1338         case TYPE_COMPOUND_STRUCT:
1339                 layout_struct_type(&type->compound);
1340                 return type->compound.compound->alignment;
1341         case TYPE_ENUM:
1342                 return get_atomic_type_alignment(type->enumt.akind);
1343         case TYPE_FUNCTION:
1344                 /* what is correct here? */
1345                 return 4;
1346         case TYPE_REFERENCE:
1347         case TYPE_POINTER:
1348                 /* TODO: make configurable by backend */
1349                 return 4;
1350         case TYPE_ARRAY:
1351                 return get_type_alignment(type->array.element_type);
1352         case TYPE_BITFIELD:
1353                 return 0;
1354         case TYPE_TYPEDEF: {
1355                 il_alignment_t alignment
1356                         = get_type_alignment(type->typedeft.typedefe->type);
1357                 if (type->typedeft.typedefe->alignment > alignment)
1358                         alignment = type->typedeft.typedefe->alignment;
1359
1360                 return alignment;
1361         }
1362         case TYPE_TYPEOF:
1363                 if (type->typeoft.typeof_type) {
1364                         return get_type_alignment(type->typeoft.typeof_type);
1365                 } else {
1366                         return get_type_alignment(type->typeoft.expression->base.type);
1367                 }
1368         }
1369         panic("invalid type in get_type_alignment");
1370 }
1371
1372 decl_modifiers_t get_type_modifiers(const type_t *type)
1373 {
1374         switch(type->kind) {
1375         case TYPE_INVALID:
1376         case TYPE_ERROR:
1377                 break;
1378         case TYPE_COMPOUND_STRUCT:
1379         case TYPE_COMPOUND_UNION:
1380                 return type->compound.compound->modifiers;
1381         case TYPE_FUNCTION:
1382                 return type->function.modifiers;
1383         case TYPE_ENUM:
1384         case TYPE_ATOMIC:
1385         case TYPE_COMPLEX:
1386         case TYPE_IMAGINARY:
1387         case TYPE_REFERENCE:
1388         case TYPE_POINTER:
1389         case TYPE_BITFIELD:
1390         case TYPE_ARRAY:
1391                 return 0;
1392         case TYPE_TYPEDEF: {
1393                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1394                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1395                 return modifiers;
1396         }
1397         case TYPE_TYPEOF:
1398                 if (type->typeoft.typeof_type) {
1399                         return get_type_modifiers(type->typeoft.typeof_type);
1400                 } else {
1401                         return get_type_modifiers(type->typeoft.expression->base.type);
1402                 }
1403         }
1404         panic("invalid type found in get_type_modifiers");
1405 }
1406
1407 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1408 {
1409         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1410
1411         while (true) {
1412                 switch (type->base.kind) {
1413                 case TYPE_ERROR:
1414                         return TYPE_QUALIFIER_NONE;
1415                 case TYPE_TYPEDEF:
1416                         qualifiers |= type->base.qualifiers;
1417                         const typedef_type_t *typedef_type = &type->typedeft;
1418                         if (typedef_type->resolved_type != NULL)
1419                                 type = typedef_type->resolved_type;
1420                         else
1421                                 type = typedef_type->typedefe->type;
1422                         continue;
1423                 case TYPE_TYPEOF:
1424                         type = type->typeoft.typeof_type;
1425                         continue;
1426                 case TYPE_ARRAY:
1427                         if (skip_array_type) {
1428                                 type = type->array.element_type;
1429                                 continue;
1430                         }
1431                         break;
1432                 default:
1433                         break;
1434                 }
1435                 break;
1436         }
1437         return type->base.qualifiers | qualifiers;
1438 }
1439
1440 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1441 {
1442         assert(kind <= ATOMIC_TYPE_LAST);
1443         return atomic_type_properties[kind].size;
1444 }
1445
1446 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1447 {
1448         assert(kind <= ATOMIC_TYPE_LAST);
1449         return atomic_type_properties[kind].alignment;
1450 }
1451
1452 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1453 {
1454         assert(kind <= ATOMIC_TYPE_LAST);
1455         return atomic_type_properties[kind].flags;
1456 }
1457
1458 atomic_type_kind_t get_intptr_kind(void)
1459 {
1460         if (machine_size <= 32)
1461                 return ATOMIC_TYPE_INT;
1462         else if (machine_size <= 64)
1463                 return ATOMIC_TYPE_LONG;
1464         else
1465                 return ATOMIC_TYPE_LONGLONG;
1466 }
1467
1468 atomic_type_kind_t get_uintptr_kind(void)
1469 {
1470         if (machine_size <= 32)
1471                 return ATOMIC_TYPE_UINT;
1472         else if (machine_size <= 64)
1473                 return ATOMIC_TYPE_ULONG;
1474         else
1475                 return ATOMIC_TYPE_ULONGLONG;
1476 }
1477
1478 /**
1479  * Find the atomic type kind representing a given size (signed).
1480  */
1481 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1482 {
1483         static atomic_type_kind_t kinds[32];
1484
1485         assert(size < 32);
1486         atomic_type_kind_t kind = kinds[size];
1487         if (kind == ATOMIC_TYPE_INVALID) {
1488                 static const atomic_type_kind_t possible_kinds[] = {
1489                         ATOMIC_TYPE_SCHAR,
1490                         ATOMIC_TYPE_SHORT,
1491                         ATOMIC_TYPE_INT,
1492                         ATOMIC_TYPE_LONG,
1493                         ATOMIC_TYPE_LONGLONG
1494                 };
1495                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1496                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1497                                 kind = possible_kinds[i];
1498                                 break;
1499                         }
1500                 }
1501                 kinds[size] = kind;
1502         }
1503         return kind;
1504 }
1505
1506 /**
1507  * Find the atomic type kind representing a given size (signed).
1508  */
1509 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1510 {
1511         static atomic_type_kind_t kinds[32];
1512
1513         assert(size < 32);
1514         atomic_type_kind_t kind = kinds[size];
1515         if (kind == ATOMIC_TYPE_INVALID) {
1516                 static const atomic_type_kind_t possible_kinds[] = {
1517                         ATOMIC_TYPE_UCHAR,
1518                         ATOMIC_TYPE_USHORT,
1519                         ATOMIC_TYPE_UINT,
1520                         ATOMIC_TYPE_ULONG,
1521                         ATOMIC_TYPE_ULONGLONG
1522                 };
1523                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1524                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1525                                 kind = possible_kinds[i];
1526                                 break;
1527                         }
1528                 }
1529                 kinds[size] = kind;
1530         }
1531         return kind;
1532 }
1533
1534 /**
1535  * Hash the given type and return the "singleton" version
1536  * of it.
1537  */
1538 type_t *identify_new_type(type_t *type)
1539 {
1540         type_t *result = typehash_insert(type);
1541         if (result != type) {
1542                 obstack_free(&type_obst, type);
1543         }
1544         return result;
1545 }
1546
1547 /**
1548  * Creates a new atomic type.
1549  *
1550  * @param akind       The kind of the atomic type.
1551  * @param qualifiers  Type qualifiers for the new type.
1552  */
1553 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1554 {
1555         type_t *const type = allocate_type_zero(TYPE_ATOMIC);
1556         type->base.qualifiers = qualifiers;
1557         type->atomic.akind    = akind;
1558
1559         return identify_new_type(type);
1560 }
1561
1562 /**
1563  * Creates a new complex type.
1564  *
1565  * @param akind       The kind of the atomic type.
1566  * @param qualifiers  Type qualifiers for the new type.
1567  */
1568 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1569 {
1570         type_t *const type = allocate_type_zero(TYPE_COMPLEX);
1571         type->base.qualifiers = qualifiers;
1572         type->complex.akind   = akind;
1573
1574         return identify_new_type(type);
1575 }
1576
1577 /**
1578  * Creates a new imaginary type.
1579  *
1580  * @param akind       The kind of the atomic type.
1581  * @param qualifiers  Type qualifiers for the new type.
1582  */
1583 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1584 {
1585         type_t *const type = allocate_type_zero(TYPE_IMAGINARY);
1586         type->base.qualifiers = qualifiers;
1587         type->imaginary.akind = akind;
1588
1589         return identify_new_type(type);
1590 }
1591
1592 /**
1593  * Creates a new pointer type.
1594  *
1595  * @param points_to   The points-to type for the new type.
1596  * @param qualifiers  Type qualifiers for the new type.
1597  */
1598 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1599 {
1600         type_t *const type = allocate_type_zero(TYPE_POINTER);
1601         type->base.qualifiers       = qualifiers;
1602         type->pointer.points_to     = points_to;
1603         type->pointer.base_variable = NULL;
1604
1605         return identify_new_type(type);
1606 }
1607
1608 /**
1609  * Creates a new reference type.
1610  *
1611  * @param refers_to   The referred-to type for the new type.
1612  */
1613 type_t *make_reference_type(type_t *refers_to)
1614 {
1615         type_t *const type = allocate_type_zero(TYPE_REFERENCE);
1616         type->base.qualifiers     = TYPE_QUALIFIER_NONE;
1617         type->reference.refers_to = refers_to;
1618
1619         return identify_new_type(type);
1620 }
1621
1622 /**
1623  * Creates a new based pointer type.
1624  *
1625  * @param points_to   The points-to type for the new type.
1626  * @param qualifiers  Type qualifiers for the new type.
1627  * @param variable    The based variable
1628  */
1629 type_t *make_based_pointer_type(type_t *points_to,
1630                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1631 {
1632         type_t *const type = allocate_type_zero(TYPE_POINTER);
1633         type->base.qualifiers       = qualifiers;
1634         type->pointer.points_to     = points_to;
1635         type->pointer.base_variable = variable;
1636
1637         return identify_new_type(type);
1638 }
1639
1640
1641 type_t *make_array_type(type_t *element_type, size_t size,
1642                         type_qualifiers_t qualifiers)
1643 {
1644         type_t *const type = allocate_type_zero(TYPE_ARRAY);
1645         type->base.qualifiers     = qualifiers;
1646         type->array.element_type  = element_type;
1647         type->array.size          = size;
1648         type->array.size_constant = true;
1649
1650         return identify_new_type(type);
1651 }
1652
1653 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1654                                        il_alignment_t *struct_alignment,
1655                                                                            bool packed, entity_t *first)
1656 {
1657         il_size_t      offset     = *struct_offset;
1658         il_alignment_t alignment  = *struct_alignment;
1659         size_t         bit_offset = 0;
1660
1661         entity_t *member;
1662         for (member = first; member != NULL; member = member->base.next) {
1663                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1664                         continue;
1665
1666                 type_t *type = member->declaration.type;
1667                 if (type->kind != TYPE_BITFIELD)
1668                         break;
1669
1670                 type_t *base_type = skip_typeref(type->bitfield.base_type);
1671                 il_alignment_t base_alignment = get_type_alignment(base_type);
1672                 il_alignment_t alignment_mask = base_alignment-1;
1673                 if (base_alignment > alignment)
1674                         alignment = base_alignment;
1675
1676                 size_t bit_size = type->bitfield.bit_size;
1677                 if (!packed) {
1678                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1679                         offset     &= ~alignment_mask;
1680                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1681
1682                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1683                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1684                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1685                                 bit_offset = 0;
1686                         }
1687                 }
1688
1689                 if (byte_order_big_endian) {
1690                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1691                         member->compound_member.offset     = offset & ~alignment_mask;
1692                         member->compound_member.bit_offset = base_size - bit_offset - bit_size;
1693                 } else {
1694                         member->compound_member.offset     = offset;
1695                         member->compound_member.bit_offset = bit_offset;
1696                 }
1697
1698                 bit_offset += bit_size;
1699                 offset     += bit_offset / BITS_PER_BYTE;
1700                 bit_offset %= BITS_PER_BYTE;
1701         }
1702
1703         if (bit_offset > 0)
1704                 offset += 1;
1705
1706         *struct_offset    = offset;
1707         *struct_alignment = alignment;
1708         return member;
1709 }
1710
1711 void layout_struct_type(compound_type_t *type)
1712 {
1713         assert(type->compound != NULL);
1714
1715         compound_t *compound = type->compound;
1716         if (!compound->complete)
1717                 return;
1718         if (type->compound->layouted)
1719                 return;
1720
1721         il_size_t      offset    = 0;
1722         il_alignment_t alignment = compound->alignment;
1723         bool           need_pad  = false;
1724
1725         entity_t *entry = compound->members.entities;
1726         while (entry != NULL) {
1727                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1728                         entry = entry->base.next;
1729                         continue;
1730                 }
1731
1732                 type_t *m_type  = entry->declaration.type;
1733                 type_t *skipped = skip_typeref(m_type);
1734                 if (! is_type_valid(skipped)) {
1735                         entry = entry->base.next;
1736                         continue;
1737                 }
1738
1739                 if (skipped->kind == TYPE_BITFIELD) {
1740                         entry = pack_bitfield_members(&offset, &alignment,
1741                                                       compound->packed, entry);
1742                         continue;
1743                 }
1744
1745                 il_alignment_t m_alignment = get_type_alignment(m_type);
1746                 if (m_alignment > alignment)
1747                         alignment = m_alignment;
1748
1749                 if (!compound->packed) {
1750                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1751
1752                         if (new_offset > offset) {
1753                                 need_pad = true;
1754                                 offset   = new_offset;
1755                         }
1756                 }
1757
1758                 entry->compound_member.offset = offset;
1759                 offset += get_type_size(m_type);
1760
1761                 entry = entry->base.next;
1762         }
1763
1764         if (!compound->packed) {
1765                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1766                 if (new_offset > offset) {
1767                         need_pad = true;
1768                         offset   = new_offset;
1769                 }
1770         }
1771
1772         source_position_t const *const pos = &compound->base.source_position;
1773         if (need_pad) {
1774                 warningf(WARN_PADDED, pos, "'%T' needs padding", type);
1775         } else if (compound->packed) {
1776                 warningf(WARN_PACKED, pos, "superfluous packed attribute on '%T'", type);
1777         }
1778
1779         compound->size      = offset;
1780         compound->alignment = alignment;
1781         compound->layouted  = true;
1782 }
1783
1784 void layout_union_type(compound_type_t *type)
1785 {
1786         assert(type->compound != NULL);
1787
1788         compound_t *compound = type->compound;
1789         if (! compound->complete)
1790                 return;
1791
1792         il_size_t      size      = 0;
1793         il_alignment_t alignment = compound->alignment;
1794
1795         entity_t *entry = compound->members.entities;
1796         for (; entry != NULL; entry = entry->base.next) {
1797                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1798                         continue;
1799
1800                 type_t *m_type = entry->declaration.type;
1801                 if (! is_type_valid(skip_typeref(m_type)))
1802                         continue;
1803
1804                 entry->compound_member.offset = 0;
1805                 il_size_t m_size = get_type_size(m_type);
1806                 if (m_size > size)
1807                         size = m_size;
1808                 il_alignment_t m_alignment = get_type_alignment(m_type);
1809                 if (m_alignment > alignment)
1810                         alignment = m_alignment;
1811         }
1812         size = (size + alignment - 1) & -alignment;
1813
1814         compound->size      = size;
1815         compound->alignment = alignment;
1816 }
1817
1818 function_parameter_t *allocate_parameter(type_t *const type)
1819 {
1820         function_parameter_t *const param = obstack_alloc(&type_obst, sizeof(*param));
1821         memset(param, 0, sizeof(*param));
1822         param->type = type;
1823         return param;
1824 }
1825
1826 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1827                              type_t *argument_type2)
1828 {
1829         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1830         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1831         parameter1->next = parameter2;
1832
1833         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1834         type->function.return_type = return_type;
1835         type->function.parameters  = parameter1;
1836         type->function.linkage     = LINKAGE_C;
1837
1838         return identify_new_type(type);
1839 }
1840
1841 type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
1842 {
1843         function_parameter_t *const parameter = allocate_parameter(argument_type);
1844
1845         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1846         type->function.return_type = return_type;
1847         type->function.parameters  = parameter;
1848         type->function.linkage     = LINKAGE_C;
1849
1850         return identify_new_type(type);
1851 }
1852
1853 type_t *make_function_1_type_variadic(type_t *return_type,
1854                                       type_t *argument_type)
1855 {
1856         function_parameter_t *const parameter = allocate_parameter(argument_type);
1857
1858         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1859         type->function.return_type = return_type;
1860         type->function.parameters  = parameter;
1861         type->function.variadic    = true;
1862         type->function.linkage     = LINKAGE_C;
1863
1864         return identify_new_type(type);
1865 }
1866
1867 type_t *make_function_0_type(type_t *return_type)
1868 {
1869         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1870         type->function.return_type = return_type;
1871         type->function.parameters  = NULL;
1872         type->function.linkage     = LINKAGE_C;
1873
1874         return identify_new_type(type);
1875 }
1876
1877 type_t *make_function_type(type_t *return_type, int n_types,
1878                            type_t *const *argument_types,
1879                                                    decl_modifiers_t modifiers)
1880 {
1881         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1882         type->function.return_type = return_type;
1883         type->function.modifiers  |= modifiers;
1884         type->function.linkage     = LINKAGE_C;
1885
1886         function_parameter_t **anchor = &type->function.parameters;
1887         for (int i = 0; i < n_types; ++i) {
1888                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1889                 *anchor = parameter;
1890                 anchor  = &parameter->next;
1891         }
1892
1893         return identify_new_type(type);
1894 }
1895
1896 /**
1897  * Debug helper. Prints the given type to stdout.
1898  */
1899 static __attribute__((unused))
1900 void dbg_type(const type_t *type)
1901 {
1902         print_to_file(stderr);
1903         print_type(type);
1904         print_string("\n");
1905         fflush(stderr);
1906 }